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Tytuł:
Anomalous Transport Properties of Carbon-Doped $EuB_6$
Autorzy:
Batkova, M.
Batko, I.
Filipov, V.
Flachbart, K.
Sechovský, V.
Shitsevalova, N.
Šantavá, E.
Šebek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1534309.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Kz
72.15.Gd
75.47.Gk
Opis:
In the presented work we report electrical, magnetic and thermal properties of $EuB_{6-x}C_{x}$ single crystals with an estimated value of x ≈ 0.07. Our studies reveal an antiferromagnetic phase transition at $T_{N}$ ≈ 6.7 K. Electrical resistivity at zero magnetic field shows a pronounced resistivity maximum at $T_{M}$ ≈ 7 K, just above the antiferromagnetic phase transition temperature. With increasing applied magnetic field the maximum moves to lower temperature and becomes totally suppressed at the field of 9 T. Observed magnetoresistance is negative in the whole studied temperature range 2-20 K, yielding a ratio of ρ(0 T, 7 K)/ρ(9 T, 7 K) ≈ 2.5. The origin of such magnetoresistance is associated with formation of mixed magnetic structure in the system due to fluctuation of carbon concentration.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 893-894
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat Capacity and Susceptibility of $CeCu_4Al$
Autorzy:
Reiffers, M.
Gažo, E.
Timko, M.
Kowalczyk, A.
Toliński, T.
Andrzejewski, B.
Šebek, J.
Šantavá, E.
Powiązania:
https://bibliotekanauki.pl/articles/1813775.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
75.30.Mb
Opis:
The heat capacity in the applied magnetic field up to 9 T, susceptibility and magnetization of polycrystalline $CeCu_4Al$ are presented. The determined electronic heat capacity coefficient γ= 210 mJ $mol^{-1} K^{-2}$ confirmed heavy fermion character of this compound. Magnetic ordering was not observed down to 0.5 K. Magnetic properties confirm these observations.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 425-428
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Heat Capacity in RTAl (R = Y, Lu;T = Ni, Cu, Pd) Compounds
Autorzy:
Daniel, P.
Javorský, P.
Prchal, J.
Daniš, S.
Šantavá, E.
Powiązania:
https://bibliotekanauki.pl/articles/1813674.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.40.Ba
75.40.Cx
Opis:
We present analysis of the specific heat of the RTAl (R = Y, Lu;T = Cu, Ni, Pd) compounds. We focus on the lattice contribution and analyze the dependence of all the characteristic parameters in the Debye and Einstein models on the atomic masses and interatomic distances.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 331-334
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Anomalies in the Specific Heat and Magnetic Susceptibility of $Na_{0.7}CoO_2$ Samples
Autorzy:
Baran, A.
Zorkovská, A.
Feher, A.
Šebek, J.
Šantavá, E.
Hejtmánek, J.
Veverka, M.
Bradarić, I.
Ružička, M.
Powiązania:
https://bibliotekanauki.pl/articles/1813849.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
72.80.Ga
Opis:
We present a comparative study of $Na_{0.7}CoO_2$ samples obtained from three different sources and prepared by different methods. The specific heat and magnetic susceptibility measurements in the temperature range 2-300 K show substantial influence on the observed anomalies, which underlines that the system is extremely sensitive to preparation protocols.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 495-498
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low Temperature Properties of the $Ce_{1-x}La_{x}NiAl_4$
Autorzy:
Toliński, T.
Kowalczyk, A.
Reiffers, M.
Šebek, J.
Šantavá, E.
Curlik, I.
Ilkovič, S.
Powiązania:
https://bibliotekanauki.pl/articles/1534742.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.27.+a
65.40.Ba
75.30.Mb
Opis:
Measurements of the heat capacity in ultralow temperatures (down to 350 mK) have been carried out for $Ce_{1-x}La_{x}NiAl_4$. The paramagnetic behavior above about 30 K can be well described by the Curie-Weiss magnetic susceptibility. The undoped CeNiAl_4 compound is a known heavy fermion system with a large electronic specific heat coefficient (γ = 0.5 J $mol^{-1} K^{-2}$) and the Kondo temperature in the range 30-80 K. In the case of the $Ce_{0.8}La_{0.2}NiAl_4$ and $Ce_{0.6}La_{0.4}NiAl_4$ compounds a peak in C/T appears below 2 K, which is strongly damped by the magnetic field. It is probably connected with the Kondo and/or magnetic interactions and the electronic specific heat coefficient is 0.19 J $mol^{-1} K^{-2}$ (0.43 J $mol^{-1} K^{-2}$) for x = 0.2 (x = 0.4) at T → 0. The value determined above the peak, at temperature for which the magnetic field starts to decrease γ ( ≈ 3 K), is about 0.5 J $mol^{-1} K^{-2}$ and the effect of the magnetic field can be well analyzed in frames of the single-ion Kondo model.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 933-935
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Temperature Magnetic Properties of Nanocomposites Containing Superparamagnetic $Fe_3C$ Particles
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Morjan, I.
Powiązania:
https://bibliotekanauki.pl/articles/1507060.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Wx
75.50.Bb
75.75.-c
Opis:
Two nanopowders containing superparamagnetic $Fe_3C$ particles, superparamagnetic $Fe_3O_4//γ-Fe_2O_3$ particles and carbon black phase were synthesised by the method of laser-induced homogeneous pyrolysis of gaseous precursors. Both were characterised by X-ray diffraction, Mössbauer spectrometry and standard magnetic measurements. The mean crystallite size of $Fe_3C$ was 3 nm for the first sample and 10 nm for the second sample. Mössbauer spectra measured at 27 K and zero-field cooled/field cooled curves measured down to 4 K are reported.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 766-767
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-Temperature Magnetic Properties of Nanometric Fe-Based Particles
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Alexandrescu, R.
Morjan, I.
Powiązania:
https://bibliotekanauki.pl/articles/1813905.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.16.Mk
82.30.Lp
75.50.Bb
75.75.+a
61.05.Qr
Opis:
Fe-based nanoparticles were prepared by laser-driven pyrolysis. The as-synthesised powder consists ofα-Fe and $Fe_3O_4//γ-Fe_2O_3$ nanoparticles embedded in a pyrolytic carbon matrix. The crystallite size of 1.8 nm forα-Fe was calculated using the Scherrer formula. The as-synthesised nanopowder was superparamagnetic. The maximum of the zero-field cooling curve was observed at 32 K and the distribution of blocking temperatures $g(T_B)$ peaked at 11 K. As a result of small particle sizes and the soft matrix, the Lamb-Mössbauer factor f was significantly higher at 4 K than at 293 K.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 561-564
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Anisotropy of $Lu_2Co_{17-x}Si_x$ Single Crystals
Autorzy:
Tereshina, E.
Andreev, A.
Šantavá, E.
Daniš, S.
Powiązania:
https://bibliotekanauki.pl/articles/1813622.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.-m
75.30.Gw
Opis:
Magnetic anisotropy of $Lu_2Co_{17-x}Si_x$ single crystals grown by the Czochralski method was investigated. The homogeneity range of Si substitution for Co extends up to x = 3.4 in $Lu_2Co_{17-x}Si_x$ solid solutions. The unit cell volume, Curie temperature, and spontaneous magnetic moment decrease monotonously with increasing Si content. $Lu_2Co_{17}$ has the easy-plane type of magnetic anisotropy in the ground state, which changes into the easy-axis type by two spin-reorientation transitions of the second-order, the easy-plane-easy-cone at $T_{SR1}$~680 K and the easy-cone - easy-axis at $T_{SR2}$~730 K. Upon Si substitution, the observed spin-reorientations shift towards the lower temperatures for $Lu_2Co_{17-x}Si_x$ $(T_{SR1}$~75 K and $T_{SR2}$~130 K in $Lu_2Co_{16}Si$) and vanish for compounds with 1
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 235-238
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Influence on the Thermal Conductivity of $PrB_6$
Autorzy:
Priputen, P.
Reiffers, M.
Gabáni, S.
Flachbart, K.
Šantavá, E.
Šebek, J.
Alekseev, P.
Nefeodova, E.
Sadikov, I.
Shitsevalova, N.
Powiązania:
https://bibliotekanauki.pl/articles/1813706.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.60.-k
72.15.Eb
Opis:
Results of thermal conductivity measurements on single crystalline $PrB_6$ sample in the temperature range of 2-30 K and in magnetic field up to 14 T are presented. The obtained results are discussed in order to estimate the electron, phonon, and magnetic contributions to thermal conductivity. Taking into account the results of electrical resistivity of this compound the temperature dependence of the reduced Lorentz function is determined.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 383-386
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Phase Transitions in TbNi(Al,In) Compounds
Autorzy:
Klicpera, M.
Javorský, P.
Šantavá, E.
Powiązania:
https://bibliotekanauki.pl/articles/1534258.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.-m
75.40.Gb
Opis:
The magnetic phase transitions in $TbNiAl_{1-x}In_{x}$ compounds were investigated by ac-susceptibility measurements. Our data reveal magnetic ordering with transition temperatures between 40 and 70 K, depending on the In concentration. All the studied compounds exhibit two or more phase transitions accompanied by distinct anomalies in the real and imaginary part of the ac-susceptibility. The paramagnetic Curie temperatures remain positive in the whole series.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 881-883
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $UFe_{2+x}$ Prepared by Splat Cooling
Autorzy:
Havela, L.
Miliyanchuk, K.
Pešička, J.
Gonçalves, A.
Waerenborgh, J.
Pereira, L.
Šantavá, E.
Šebek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813628.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.28.+d
75.50.Bb
Opis:
A series od $UFe_{2+x}$ materials was prepared using splat cooling. The Laves phase structure can accommodate up to 0.3 Fe excess, while $T_C$ is enhanced from 172 K to approximately 240 K. Higher Fe concentration leads to the segregation of α-Fe. $\text{}^{57}Fe$ Mössbauer spectroscopy indicates higher Fe magnetic hyperfine fields on Fe nuclei occupying the U sublattice than for the regular Fe sites.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 247-250
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $γ-Fe_2O_3$ Nanopowder Synthesized by Atmospheric Microwave Torch Discharge
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Jašek, O.
Powiązania:
https://bibliotekanauki.pl/articles/1419658.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.50.Sw
81.07.Wx
76.80.+y
Opis:
A nanopowder containing $γ-Fe_2O_3$ particles was synthesized by adding a gas mixture of $H_2//Fe(CO)_5$ into a microwave torch discharge at 1 bar. The presence of $γ-Fe_2O_3$ phase was confirmed by powder X-ray diffraction (mean crystallite size $d_{XRD}$=24 nm). The dominating characteristic sextets of $γ-Fe_2O_3$ were identified in the Mössbauer spectrum taken at 5 K. The presence of pure $Fe_3O_4$ in the nanopowder was excluded. The Mössbauer spectrum taken at 5 K exhibited six times larger total spectrum area than the Mössbauer spectrum taken at 293 K. Zero field cooled/field cooled curves measured down to 4 K in the magnetic field of 7.9 kA/m are reported.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 9-11
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of γ-Fe₂O₃ Nanopowder Synthesized by Atmospheric Microwave Torch Dischargie. Acta Physica Polonica A 122, 9 (2012), ERRATUM
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Jašek, O.
Powiązania:
https://bibliotekanauki.pl/articles/1398694.pdf
Data publikacji:
2016-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
99.10.Cd
Opis:
A nanopowder containing γ-Fe₂O₃ particles was synthesized by adding a gas mixture of H₂/Fe(CO)₅ into a microwave torch discharge at 1 bar. The presence of γ-Fe₂O₃ phase was confirmed by powder X-ray diffraction (mean crystallite size $d_{XRD}$=24 nm). The dominating characteristic sextets of γ-Fe₂O₃ were identified in the Mössbauer spectrum taken at 5 K. The presence of pure $Fe_3 O_4$ in the nanopowder was excluded. The Mössbauer spectrum taken at 5 K exhibited six times larger total spectrum area than the Mössbauer spectrum taken at 293 K. Zero field cooled/field cooled curves measured down to 4 K in the magnetic field of 7.9 kA/m are reported.
Źródło:
Acta Physica Polonica A; 2016, 129, 1; 168
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetotransport Properties of $CaTi_xRu_{1-x}O_3$ (x=0, 0.07)
Autorzy:
Zorkovská, A.
Baran, A.
Feher, A.
Šebek, J.
Šantavá, E.
Bradarić, I.
Powiązania:
https://bibliotekanauki.pl/articles/1813683.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Pq
73.43.Qt
75.47.-m
Opis:
Electrical resistance, transversal magnetoresistance and the Hall effect were studied on polycrystalline $CaTi_xRu_{1-x}O_3$ (x=0, 0.07) samples using a conventional Quantum Design PPMS-9 equipment in the temperature range 2-300 K and magnetic field up to 9 T. Substantial differences were found between the two samples: (i) opposite to the metallic character of $CaRuO_3$, the substituted sample has insulating-like electrical resistance;(ii) the magnetoresistance of the substituted sample changes the sign from negative to positive values with increasing temperature. The magnetoresistance of $CaRuO_3$ is negative, the sign reversal is induced by magnetic field and only at temperatures below 15 K, such a behaviour is predicted for clustered systems;(iii) the Hall voltage in pure $CaRuO_3$ also changes sign from negative to positive values above 35 K. This temperature coincides with the observed magnetic transition temperature, indicating that the magnetic state and the carrier character interrelate.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 351-354
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat and Magnetism of $LuFe_6Al_6$
Autorzy:
Svoboda, P.
Andreev, A.
Šantavá, E.
Šebek, J.
Powiązania:
https://bibliotekanauki.pl/articles/1813662.pdf
Data publikacji:
2008-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.40.Cx
65.40.Ba
Opis:
Here we present the results of the zero-field specific heat study of the $LuFe_6Al_6$ single crystal. The specific heat data were analyzed as a sum of the phonon, electronic, and magnetic contributions, respectively. The analysis of the phonon part involves three acoustic and 36 optical branches, respectively, all of them corrected for the anharmonicity. The magnetic part of the specific heat was obtained by subtracting the electronic and the phonon part from the experimental specific heat and the magnetic entropy was calculated.
Źródło:
Acta Physica Polonica A; 2008, 113, 1; 307-310
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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